Filter for a round fan



FIG. 1 is a front view.

FIG. 2 is a rear view.

FIG. 3 is a right side view.

FIG. 4 is a left side view.

FIG. 5 is a top view; and,

FIG. 6 is a bottom view.

The broken-line in FIGS. 3-6 represents stitching. 

The ornamental design for a filter for a round fan, as shown and described. 